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    <title>Document</title>
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        <div class="topNav">
            <div class="leftArrow"><</div>
            <div class="title">选择科室</div>
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        <!-- 主要内容 -->
        <div class="mainContent">
            <div class="left">
                <div class="item">外科</div>
                <div class="item">眼科</div>
                <div class="item">口腔科</div>
            </div>
            <div class="right">
                <div class="item">普通内科</div>
                <div class="item">神经内科</div>
                <div class="item">消化内科</div>
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        </div>
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